Friedeich pfeiffer and carl lier



(No Model.)

F. PIBIFFER 8v C. LIER. RAILWAY CONSTRUCTION.

Patented May 2l, 1895.

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A f7; Witnesses: -A www xmanw v W www M .f Zi MMM...

vanne t UNITED STATES" PATENT OFFICE.

` FRIEDRICH PFEIFFER AND CARL LIER, OF WALKENRIED, GERMANY.

RAILWAY` CONSTRUCTION.

SPECIFICATION forming part of LettersA Patent No. 539,592, dated May 21, 1895.

Application niet August 18,1894. stanno. 520,705. (Numana To all whom it may concern,.-

Be it known that we, FRIEDRICH PEEIFEER and CARL LIER, subjects of the Emperor of Germany, and residents of Walkenried, in the Empire of Germany, have invented anew and useful Railway Construction, of which the following is a specification.

In the construction of railways it has hitherto been impossible to efficiently secure the rails against shifting and displacement. Whether in the case of cross or longitudinal sleepers, the external influences exercise the same shifting effect upon the superstructure. The present invention overcomes this drawback, shifting of the superstructure being prevented, not by using, as in previous railway constructions, a relatively thin layer of gravel or sand, but by laying under the rails adouble track of concrete embedded in sand, in which track the cross sleepers rest.' In this way the sleepers are held by fastenings, which take up the pulling and pressing effect, united t0 a rigid inflexible whole.

In the accompanying drawings, Figure 1 shows a cross-section through a part of the superstructure and substructure. Fig. 2 shows a plan view of the railway-track. Fig. 3 shows a cross-section of the same. Fig.4 shows the manner of setting the fish-plates in the concrete blocks.

As is shown in Fig. 3, underneath each rail is a substructure@ of a trapezoidal cross-section. This is formed in suitable manner of concrete blocks, and hasformed in it at Ycertain distances, drain -channels f, running slantingly` toward the outside. These carry away the rain-water, which falling between the concrete tracks a a, runs through Ythe gravel filling lc, lying on the roof-shaped concrete layer e. The concrete layer ekeep's the tracks a in place. The tops of the concrete tracks a a, which protrude somewhat less than the thickness of a sleeper above the sand, are grooved out at suitable distances, for the reception of the cross-sleepers c. Theseproject only a small fraction of their thickness above the surface of the concrete blocks a, a, so that the rails nowhere lie directly upon the concrete tracks, whereby, first, the shock of a railway-train running over it, has no direct effect upon the concrete foundation, and, secondly, the necessary elasticity of the rails is preserved. The separate concrete blocks are secured together by dove-tail shaped wedges d.

Some of the sleepers are constructed and set in special manner. They are made in a dove-tail form, and as g in Fig. 2 shows, are let into the concrete tracks. It is obvious that sleepers of this description cannot possibly undergo any lateral movement. The

rails are moreover especially secured from shifting by the suitably formed flshfplates Z.

As Figs. 1, 2 and t show, the fish-plates are provided with two lugs h h, between which the cross sleeper g lies, and which as Fig. 4 shows are let into the concrete foundation. By means of these sh-plates, which are fastened into the concrete and lie against the sleepers g, shifting of the rails in any direc--- tion' whatever is prevented.

What we claim is' l. Railway superstructure for preventing displacement of the rails, formed by two continuously running concrete track supports a a, which are made of cast concrete blocks, secured by dove-tail-wedges d, and the sleepers g which serve for stiffening, as also the concrete layer e and the two lugs h of the fishplates Llet into the blocks, as set forth.

2. A railway superstructure consisting of continuous concrete supports as a a, havingl drainage openings, the concrete layer e, and theintermediate filling of gravel, or light marterial, substantially as described.

3. A railway superstructure consisting of continuous, longitudinal supports beneath the rails, and of impervious material having openings for drainage, and a water tight bottom or flooring of thespace between said supe ports and a filling, to the surface, also between said supports of gravel or some other porous material, substantially as described.

FRIEDRICH PFEIFFER. CARL LIER. Witnesses:

,FERDINAND KOBITZOCH,

HERMANN YURENZ. 

